Re: [dpdk-dev] [PATCH v2 1/4] net/bnx2x: fix build with gcc11

[Kevin Traynor <ktraynor@redhat.com>]

On 11/05/2021 12:44, Ferruh Yigit wrote:
> Reproduced with '--buildtype=debugoptimized' config,
> compiler version: gcc (GCC) 12.0.0 20210509 (experimental)
> 
> Build error:
> In file included from ../drivers/net/bnx2x/bnx2x_rxtx.c:8:
> ../drivers/net/bnx2x/bnx2x_rxtx.c: In function ‘bnx2x_upd_rx_prod_fast’:
> ../drivers/net/bnx2x/bnx2x.h:1528:35:
>     warning: ‘rx_prods’ is used uninitialized [-Wuninitialized]
>  #define REG_WR32(sc, offset, val) bnx2x_reg_write32(sc, (offset), val)
>                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ../drivers/net/bnx2x/bnx2x.h:1531:33:
> 	note: in expansion of macro ‘REG_WR32’
>  1531 | #define REG_WR(sc, offset, val) REG_WR32(sc, offset, val)
>       |                                 ^~~~~~~~
> ../drivers/net/bnx2x/bnx2x_rxtx.c:331:9:
> 	note: in expansion of macro ‘REG_WR’
>   331 |         REG_WR(sc, fp->ustorm_rx_prods_offset, val[0]);
>       |         ^~~~~~
> ../drivers/net/bnx2x/bnx2x_rxtx.c:324:40: note: ‘rx_prods’ declared here
>   324 |         struct ustorm_eth_rx_producers rx_prods = { 0 };
>       |                                        ^~~~~~~~
> 
> REG_WR32 requires 'uint32_t', use union instead of cast to 'uint32_t'.
> 

Bugzilla ID: 692

> Fixes: 38dff79ba736 ("net/bnx2x: update HSI")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>

Acked-by: Kevin Traynor <ktraynor@redhat.com>

> ---
> Cc: rmody@marvell.com
> Cc: Kevin Traynor <ktraynor@redhat.com>
> Cc: Ajit Khaparde <ajit.khaparde@broadcom.com>
> 
> v2:
> * fix struct initialization as '{0}' -> '{{0}}'

(I won't be surprised if some compiler in the ci complains, but ok on
F34, gcc 11.1.1 and RHEL8.3, gcc 8.3.1)

> ---
>  drivers/net/bnx2x/bnx2x_rxtx.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/bnx2x/bnx2x_rxtx.c b/drivers/net/bnx2x/bnx2x_rxtx.c
> index 57e2ce504587..2b1760229051 100644
> --- a/drivers/net/bnx2x/bnx2x_rxtx.c
> +++ b/drivers/net/bnx2x/bnx2x_rxtx.c
> @@ -321,14 +321,15 @@ static inline void
>  bnx2x_upd_rx_prod_fast(struct bnx2x_softc *sc, struct bnx2x_fastpath *fp,
>  		uint16_t rx_bd_prod, uint16_t rx_cq_prod)
>  {
> -	struct ustorm_eth_rx_producers rx_prods = { 0 };
> -	uint32_t *val = NULL;
> +	union {
> +		struct ustorm_eth_rx_producers rx_prods;
> +		uint32_t val;
> +	} val = { {0} };
>  
> -	rx_prods.bd_prod  = rx_bd_prod;
> -	rx_prods.cqe_prod = rx_cq_prod;
> +	val.rx_prods.bd_prod  = rx_bd_prod;
> +	val.rx_prods.cqe_prod = rx_cq_prod;
>  
> -	val = (uint32_t *)&rx_prods;
> -	REG_WR(sc, fp->ustorm_rx_prods_offset, val[0]);
> +	REG_WR(sc, fp->ustorm_rx_prods_offset, val.val);
>  }
>  
>  static uint16_t
>